| 摘要 |
Each of presence servers 13 and 14 is capable of holding presence information on devices connected thereto, and transmits the held presence data to any one of the devices connected thereto, in response to a presence reference request from the device. A media conversion server 15 has a function to convert provided image data or audio data into a designated format, and is capable of receiving both requests from the presence servers and requests from portable terminals. A data server 16 is a server which stores image data and audio data, and is accessible by the portable terminals 11 and 12, the personal computer 17 and the like. Such devices able to access the data server 16 can store any data into a data storage 161 in the data server. Not only the devices or users having registered the data but also other devices or users can refer to the data stored in the data storage 161.
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